You should still be able to go out with your buddies for the weekend, just like how she'll need the girl's weekend and Spa trip. It's unhealthy if your girlfriend is controlling and wants to know what you are doing every minute, but a simple "honey, I want go out with the guys this evening" with some advance warning should be fine with her. Everyone needs some alone time with their significant other, just as it's important that both fo you have your own friends.
Like everyone else has said, these things will pop into your head from time to time, but in the end, you'll know if she's the one
Good luck
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